This is so cute! A faux book to put together with a wrap-around cover and a box area inside for housing ATCs or for building a little shrine.
See the Bird Book Covers Collage Sheet for covers sized to fit this box (and more info on those pretty bird ATCs and book box (below) by Lora Mahaffey are in the blog).
Note: the spine and front cover are separate pieces that you'll need to hinge together with paper tape (the box notches into the back cover so it is a fixed piece). Ships flat, but easy to put together with a bit of glue. Heavyweight chipboard.